When stomata are present exclusively on the upper surface of the leaves, it is called

Options

A. Hypostomatic
B. Epistomatic
C. Amphistomatic
D. Astomatic

Answer

To answer the question "When stomata are present exclusively on the upper surface of the leaves, it is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Leaves**:
- Leaves have surfaces where stomata (tiny openings for gas exchange) can be located. These stomata can be found on the upper surface, lower surface, or both.

2. **Identify Stomatal Locations**:
- Stomata can be categorized based on their location:
- **Epistomatic**: Stomata present on the upper surface of the leaf.
- **Hypostomatic**: Stomata present on the lower surface of the leaf.
- **Amphistomatic**: Stomata present on both surfaces.

3. **Focus on the Question**:
- The question specifically asks about stomata that are present exclusively on the upper surface.

4. **Conclude the Answer**:
- Since stomata that are exclusively on the upper surface of the leaf are referred to as "epistomatic," this is the correct term to use.

### Final Answer:
When stomata are present exclusively on the upper surface of the leaves, it is called **epistomatic**.

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